aquaman is fucking useless. and he was ripped off by the even gayer sub-mariner.
ant man is a rip off of the atom. Although to make up for it they later combined ant man with giant man so the new ant man is just a guy that can change his size basically to whatever dimensions he wants to, which is kinda cool.
but then again, the atom was eaten by a venus fly trap and he became plant man, which was a pretty cool character that was later ripped off to become swamp thing and Marvel's Man-thing.
I'd say the worst superhero is superman, because he can basically do anything and so there really is no point in having any other superheroes. why do you even need the Justice League? they are all just people that have lesser-degrees of superman's powers. like the Flash, he goes really fast.. but so does superman, so the flash is pointless and he'd get his ass kicked by all the rest of supe's powers. lame.
metamorpho the element man is pretty lame. I'm not really sure what he can do. maybe he might be cool, but he sucks ass by virtue of his origin. he's an amalgam (pun intended) of the original element team, which was a group of heroes such as tin man, bronze man, you get the picture, that could morph only into pre-existing objects made out of their elements. what the fuck is gold man going to morph into? some bling for flavor flav?